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== Use of the Celestial Sphere as a Frame of Reference ==
 
== Use of the Celestial Sphere as a Frame of Reference ==
 
The use of the stars as a relatively slow system lets the celestial sphere tell us how much the [[spectrum]] from hot [[hydrogen]] and [[helium]] has shifted from the norm in [[electromagnetic frequency]].
 
The use of the stars as a relatively slow system lets the celestial sphere tell us how much the [[spectrum]] from hot [[hydrogen]] and [[helium]] has shifted from the norm in [[electromagnetic frequency]].
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[[Category:Meteorology]]
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[[Category:Physics]]
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